Contact

Found a wrong number, an outdated figure or a calculator you need? Write to us.

Email: vkevinxz@gmail.com

To report an error

Please include the page address, the numbers you entered, the result you got and the result you expected. We check reports against the formulas and sources and fix confirmed errors. See the editorial policy for how corrections are handled.

What we cannot do

We read every message, but we cannot give project-specific advice, quotes or professional opinions.